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A kind of anionic heat thickening water-soluble polymer and its preparation method and application

A water-soluble polymer, anionic technology, applied in the direction of drilling compositions, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of high preparation and application costs, difficult post-processing, long dissolution time, etc. Achieve the effects of reducing application costs, improving production efficiency, and reducing dissolution time

Active Publication Date: 2019-06-04
SICHUAN UNIV
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AI Technical Summary

Problems solved by technology

The Pluronic used in this method has a high content of temperature-sensitive macromolecules (47%, w / w), which brings high costs. The solution obtained in the later stage has too high viscosity and is not easy to post-process, and it takes 2 days for the obtained dry powder to be dissolved in water. time consuming
The existing method of preparing thermal tackified polymers by dispersion polymerization also has problems such as high preparation cost, unsuitable post-processing, and long time consumption.
[0011] To sum up, although thermal tackifying polymers with different structures and properties can be prepared at present, the prepared thermal tackifying polymers have low molecular weight and can only have thermal tackifying ability at high concentrations, and the cost of preparation and application is relatively high. , it takes a long time to dissolve in use, which is not conducive to the industrial application of polymers
[0012] Patent 20030204014A1 describes the preparation process of an inverse emulsion of a thermally thickening polymer. Sorbitan fatty acid ester and polyvinyl alcohol fatty acid ester are selected as compound emulsifiers. The thermally thickening polymer is composed of 2-acrylamide-2 -Sodium methyl propane sulfonate, sodium acrylate and double bond modified polyether are polymerized, and the obtained molecular weight is 2×10 6 g·mol -1 , the solid content reaches 30wt%, but the obtained polymer solution has good thermal and salt viscosity-increasing effects only at 0.5% (w / w), and because the double-bond modified polyether monomer is synthesized separately, its Molecular weight and repeatability are not good
In the practical application of polymer flooding for tertiary oil recovery, considering the input-output ratio, the highest concentration of polyacrylamide polymers that can be used is 0.2% (w / w), so these polymers only have thermal viscosity increase at high concentrations. Behavioral polymers are difficult to obtain industrial applications

Method used

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  • A kind of anionic heat thickening water-soluble polymer and its preparation method and application
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  • A kind of anionic heat thickening water-soluble polymer and its preparation method and application

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Experimental program
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Effect test

Embodiment 1-18

[0064] The following table explores the optimal inverse emulsion ratio from the four aspects of emulsifier type, oil-water ratio, monomer ratio, and the presence or absence of NaAA, so as to obtain the optimal anionic thermal tackifying polymer.

[0065] Table 1 Effect of emulsifier type on emulsion state

[0066]

[0067]

[0068] a × means no inverse emulsion was prepared, √ means inverse emulsion was prepared.

[0069] Table 2 Effect of oil-water ratio on emulsion state

[0070]

[0071] a × means no inverse emulsion was prepared, √ means inverse emulsion was prepared.

[0072] Table 3 Effect of monomer ratio on polymer properties

[0073]

[0074]

[0075] a × represents that the prepared polymer dry powder has no thermal viscosity-increasing property, and √ represents that the prepared polymer dry powder has thermal viscosity-increasing property.

[0076] Table 4 Effect of the presence or absence of NaAA monomer on polymer properties

[0077]

[0...

Embodiment 19

[0081] Dissolve 31.7% (w / w, the same below) of acrylamide, 9.5% of sodium acrylate, 8.6% of F127, and 5.0% of sodium chloride in 45.2% of deionized water, adjust the pH to 7.0, and prepare water Mutually. Dissolve 14.0% emulsifier HB246 in 86.0% mineral oil, heat to 50°C to dissolve, then add the oil phase and water phase to the emulsifier in sequence according to the ratio of mass ratio oil phase:water phase=4.5:5.5, Stir well and emulsify. After the emulsification is completed, transfer it to a 250mL four-neck flask equipped with stirring, nitrogen tube, and digital display thermometer, raise the temperature to 45°C in a water bath, and after passing nitrogen for a certain period of time, add the initiator AIBN, and start the polymerization. After the thermometer shows that the temperature rise is over, keep warm for 2 hours. The inverse emulsion ETVP-P1 of the anionic heat-thickening water-soluble polymer is obtained, and the obtained inverse emulsion is precipitated, was...

Embodiment 20

[0083] Dissolve 31.7% (w / w, the same below) of acrylamide, 9.5% of sodium acrylate, 8.6% of F108, and 5.0% of sodium chloride in 45.2% of deionized water, adjust the pH to 7.0, and prepare water Mutually. Dissolve 14.0% emulsifier HB246 in 86.0% mineral oil, heat to 45°C to dissolve, then add the oil phase and water phase to the emulsifier in sequence according to the ratio of mass ratio oil phase: water phase = 4.5:5.5, Stir well and emulsify. After the emulsification is completed, transfer it to a 250mL four-neck flask equipped with stirring, nitrogen tube, and digital display thermometer, raise the temperature to 45°C in a water bath, and after passing nitrogen for a certain period of time, add the initiator AIBN, and start the polymerization. After the thermometer shows that the temperature rise is over, keep warm for 2 hours. The inverse emulsion ETVP-P2 of the anionic heat-thickening water-soluble polymer is obtained, and the obtained inverse emulsion is precipitated, ...

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Abstract

A method for preparing an anionic thermoviscosifying water-soluble polymer includes the following steps: performing an inverse emulsion polymerization by using acrylamide, acrylic acid and Pluronic triblock polymer. The high reactivity of acrylamide and the inverse emulsion polymerization can increase the molecular weight of the thermoviscosifying polymer, and exhibit an obvious thermoviscosifying effect even at a low polymer concentration, which can reduce the application cost. The dissolution rate of the obtained polymer emulsion is significantly higher than the dissolution rate of the dry powder of the polymer. The obtained emulsion-diluted solution has a relatively strong thermoviscosifying behavior after further adding a small amount of reverse demulsifier, and the emulsion-diluted solution exhibits different thermoviscosifying behaviors as the amount of the reverse demulsifier is increased.

Description

technical field [0001] The invention belongs to the field of intelligent water-soluble polymers and the field of oil and gas exploitation, and specifically relates to a thermally thickened water-soluble polymer and its preparation method and application. Background technique [0002] With the rapid development of my country's economy, the dependence on oil and natural gas is gradually increasing. Polymer flooding tertiary oil recovery is an effective means to enhance oil recovery. Water-soluble polymers, especially partially hydrolyzed polyacrylamide (HPAM), have been widely used in tertiary oil recovery due to their easy availability, low cost, good water solubility, and strong viscosity-increasing properties. However, as oil and gas production shifts to deep wells, high-temperature, high-salt reservoirs, and on-site use of produced sewage to prepare polymer solutions, HPAM shows the disadvantage of poor temperature and salt resistance. [0003] A large number of studies ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F220/06C08F220/56C08F226/10C08F2/32
CPCC08F2/32C08F283/06C08F220/56C08F220/06C08F226/10C08F287/00C08F290/062C09K8/588C08F220/585B01J13/00C09K2208/00
Inventor 冯玉军王蒙蒙
Owner SICHUAN UNIV
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